Burglar-alarm



W. B. HOWELL.

BURGLAR ALARM;

No. 256,321. r Patented Apl 11, 1882.

(Model) n A I 1 W. (Pym! UNITED STATES PATENT. ()FFICE.

\ WILLIAM B. HOWELL, OF ALBANY, MISSOURI.

'BURGLAR-ALARM.

SPECIFICATION forming part of Letters Patent No. 256,321, dated April Application filed February 15. 1882. (ModeL) To all whom it may concern:

Be it known that 1, WILLIAM B. HOWELL, a citizen of the United States, residing at Al bany, in the county of Gentry and State of Missouri, have invented certain new and useful Improvements in Burglar-AlarmsforShow- Cases, of which thefollowing is a specification,

tion; Fig. 2, a cross-section; Fig. 3, a side elevation of the alarm mechanism, Fig. 4, a top plan View of the alarm mechanism, and Figs. 5 and Gare details of the same; and Fig. 7 is across-section, showing the manner of supporting the arm to which the gong is pivoted.

A is the show-case, of which a is the frame and a the glass. v

B is a gong, and is secured to the outer end of the arm b, whichis journaled in the plate I), secured to the upper innerside of the frame a, as shown. Attached to the lower portion of the plate is a log, b upon which the arm b rests to prevent the gong fromi'allingtoolow. Projecting horizontally from the plate I) is an arm, I), the outer end of whichis bent at right angles, as shown, and journaled through it is the shaft 0.

C is a shaft-,journaled in hangers a on the frame a and through the arm I), as shown. It isprovided withdownwardly-projectinglatches c, a stop-lug, c, and on its inner end with a clapper, c, which is adapted to strike the gong B in the operation, of the device. Passing through the shaft, wound around it and secured to the arm If, is a spring, a, which acts to hold the shaft in theposition showninFig's. 1, 3, and 4.

D is the door ofthe show-case, and is pro Vided with a spring-latch, d, as shown. Se:

cured to the upper inner side of the door D are knuckles d, in which is pivoted the closed latch 01 The latch is held in a horizontal position by the spring 01 Fig. 6, which is placed under its lower portion. When in position for action the closed latches 01 will embrace the latches c, as shownin Figs.2,4, and 5. \Vhen the door or doors D are opened it will be seen that the latches 01 will draw the latches 0 back and rotate the shaft 0 until the end of said latches c slip over the ends of the latches d. The spring a will then cause the shaft to rotate back to its original position, which will cause the clapper c to strike the gong.

The device is so arranged that the stop-lug 0 will strike the bent end of the arm b just before the clapper strikes the gong, so that said clapper will immediately spring back to its normal position al'terit has given the stroke. In closing the door the closed latch d will be carried downward past the end of the latch c, and will then recover its horizontal position by the pressure of the spring d What I claim is- 1. In a burglar-alarm, the combination of the shaft 0, its latches c,-stop-lug c clapper 0 with the gong B, and spring cflsubstantially as shown and described.-

2. In a burglar-alarm, the combination of the shaft 0, its latches 0, stop-lug c and clapper 0 and 'spring 0 with the plate 1), arm b, and gong B, all arranged to operate substair tially as shown and described. I

3. The combination of the latches (1 ant knuckles d with the shaft 0 and its latches c and clapper 0 with the gong B, all arranged to operate substantially as shown and de scribed.

In testimony whereof I affix my signature in presence of two witnesses.

WILLIAM BUTLER HOWELL.

Witnesses:

JAMES H. GILLESPIE, BENTON GIBBARY. 

